On the eve of its anniversary, I-Reporters responded to yet another major news event: the deadly collapse of a bridge over the Mississippi river in Minneapolis, Minnesota.

Mark Lacroix sent photos of the scene immediately after the disaster. As the story developed, he provided information about the situation to viewers live on television.

Lacroix's photos were among the more than 450 I-Report submissions sent to CNN within the first 24 hours of the bridge's collapse -- the biggest response in one day to a single news event in I-Report history.